United States Department of Transportation
i
Assessment of Techcrete : a concrete repair material and joint sealant.
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2013-01-01
[PDF-1.64 MB]
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Abstract:Joint sealing and resealing is a commonly performed concrete pavement maintenance activity that serve
s
two
purposes. First, it minimizes water infiltration; second, it prevents intrusion of solid materials in the joints. There
are many sealants available for resealing concrete joints including hot
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poured, rubberized asphalt sealants and
silicone sealants
. According to a Federal Highway Administration technology brief, “the hot
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poured, rubberized
asphalt sealants are less expensive than silicone materials but generally have shorter life expectancies (typically, 4
to 8 years for hot
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poured sealants and 5 t
o 10 for silicone sealants) [1].
In the fall of 2007, the City of Winooski resealed some of the pavement joints located along US Route 2 and 7 as
part of their periodic preventative maintenance work, with a new hot
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poured product, TechCrete, manufactured
by
Crafco. According to Crafco, this flexible material is a hot
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poured product for concrete repairs, which provides high
tensile strength and high compressive resistance. It is comprised of a combination of several resins, polymers,
and aggregate. In ad
dition, it has proven to provide a long
-
term life span in most applications. According to the
manufacturer, once the material has properly cured, the materials will not de
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bond or crack while remaining flexible
during the expansion and contraction of the
adjacent concrete slabs. Additionally, the affected lane can be open to
traffic within one hour of application.
In 2008, Crafco contacted VTrans to have TechCrete added to the Approved Products list. This study is an
evaluation of the product. VTran
s selected the Winooski site and a site in South Burlington where a concrete
pavement was placed in 1997 that exhibited similar deterioration, to conduct a field evaluation of the product.
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